jd21476
Line Up and Wait
Is there a difference between the G5 that replaces the Attitude Indicator and the one that does the DG/HSI? I thought you could select which one you want when you buy it and the G5 does either, correct?
So when I look at a site like Aircraft Spruce I can see three different G5 prices. Which one do I need so that it will connect to my Garmin GNC355 and work as a DG/HSI?
You need the G5 HSI with the GMU-11. If you want to interface with an autopilot, you need both the GMU-11 and GAD29B.
The nice thing about the expensive one with the remote magnetometer is that you won't have to continually update it to match your mag compass, like you do with a mechanical DG.I dont have autopilot so it wont be an issue but sounds like I needs the expensive one anyway
The nice thing about the expensive one with the remote magnetometer is that you won't have to continually update it to match your mag compass, like you do with a mechanical DG.
But if I find a used Attitude Indicator I could buy it and then just purchase the GMU11 and GAD29B separate, correct?
I believe that the STC'd version require two display heads. On mine, I can toggle between DG and HSI, but it's the Experimental version. Heading and autopilot are part of the EFIS so I skipped the GMU and GAD. The G5 is pretty much just backup.Is there a difference between the G5 that replaces the Attitude Indicator and the one that does the DG/HSI? I thought you could select which one you want when you buy it and the G5 does either, correct?
I believe that the STC'd version require two display heads. On mine, I can toggle between DG and HSI, but it's the Experimental version. Heading and autopilot are part of the EFIS so I skipped the GMU and GAD. The G5 is pretty much just backup.
Just to be clear, STC vs experimental are the same hardware (for the G5 itself, the GMU11 and GAD29B have PMA'd and non-PMA'd variants), so is the software. It's all just configuration options. When installing the "certified" way, you select the installation type to "certified instrument" which disables some of the stuff that the experimental are allowed to do (like the large HSI) and when installing as an AI per STC you have to disable the switching between AI and HSI on the G5 installed as an AI. The HSI is configured to boot as an HSI, but can be switched to AI at any time and will automatically switch to an AI if you turn off the AI in a dual G5 install, when installed as just an HSI and you keep your vacuum AI, it's nice that you can revert the HSI to AI if your vacuum AI goes TU. There is no difference between a G5 you buy as an AI vs HSI, other than what other hardware comes in the kit. AI comes alone, HSI comes either with GMU11 or with a GMU11 and GAD29B. You could buy the AI kit, later decide to install something else for an AI and move the G5 to HSI, and add the GMU11 and GAD29B and change the config and poof, it's now an HSI... there would be no need to buy the "right" G5.
I thought (I'll try again next time out to the hangar) that I could switch both the G5s between AI and HSI. Or is the disabling the HSI on the AI not required for a dual installation?
The GAD29 gives you ARINC 429 support — that's what lets the G5 act as an HSI (including lateral and vertical course deviation) rather than just a DG, and allows the GFC 500 to follow a flight plan from your GPS or to fly an approach. Without that, the GFC 500 wouldn't be very useful except for holding a heading or altitude.So I still need the expensive G5 even though I am connecting it to my Garmin GNC355? It still needs the GMU11 and GAD29B, correct?
So I dont have autopilot and I was told by a friend that I would only need the GMU11 and not the GAD29. He said the GAD29 is more for those with Autopilot
If you do that then there's no way to get lateral/vertical guidance from the GNC355 to the G5 and no way to get heading from the G5 to the GNC355.So I dont have autopilot and I was told by a friend that I would only need the GMU11 and not the GAD29. He said the GAD29 is more for those with Autopilot
I have a vague recollection that, unlike the G5, the GI-275 does not require the GAD29(B) to get lateral and vertical course info from the GPS navigator. Can anyone confirm? That would make the price difference a little less painful (save $500-650), and it's a much nicer unit.
Well I guess the plane isn't airworthy, can set either one to HSI or AI mode.
The AV-30C can display DG or HSI mode using GPS input, but it is not slaved to a magnetometer like the G5. Having the GMU-11 is a huge benefit. One less thing to deal with in flight.